EP2223785B1 - Timbre acoustique pour instrument de musique - Google Patents

Timbre acoustique pour instrument de musique Download PDF

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Publication number
EP2223785B1
EP2223785B1 EP10001361.4A EP10001361A EP2223785B1 EP 2223785 B1 EP2223785 B1 EP 2223785B1 EP 10001361 A EP10001361 A EP 10001361A EP 2223785 B1 EP2223785 B1 EP 2223785B1
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EP
European Patent Office
Prior art keywords
fibers
woody
epoxy resin
composite wooden
wooden material
Prior art date
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Application number
EP10001361.4A
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German (de)
English (en)
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EP2223785A2 (fr
EP2223785A3 (fr
Inventor
Tatsuya Hiraku
Hiroyasu Abe
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Yamaha Corp
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Yamaha Corp
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Publication of EP2223785A3 publication Critical patent/EP2223785A3/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/002—Manufacture of substantially flat articles, e.g. boards, from particles or fibres characterised by the type of binder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • B27N3/14—Distributing or orienting the particles or fibres
    • B27N3/143—Orienting the particles or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/02—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board the layer being formed of fibres, chips, or particles, e.g. MDF, HDF, OSB, chipboard, particle board, hardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/04—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B21/042—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/10—Next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/14—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood board or veneer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/12—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by the relative arrangement of fibres or filaments of different layers, e.g. the fibres or filaments being parallel or perpendicular to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L97/00—Compositions of lignin-containing materials
    • C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10D—STRINGED MUSICAL INSTRUMENTS; WIND MUSICAL INSTRUMENTS; ACCORDIONS OR CONCERTINAS; PERCUSSION MUSICAL INSTRUMENTS; AEOLIAN HARPS; SINGING-FLAME MUSICAL INSTRUMENTS; MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR
    • G10D9/00—Details of, or accessories for, wind musical instruments
    • G10D9/08—Material for manufacturing wind musical instruments; Treatment of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/021—Fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/026—Wood layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04—Impregnation, embedding, or binder material
    • B32B2260/046—Synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/06—Vegetal fibres
    • B32B2262/062—Cellulose fibres, e.g. cotton
    • B32B2262/065—Lignocellulosic fibres, e.g. jute, sisal, hemp, flax, bamboo
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/58—Cuttability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/706—Anisotropic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/72—Density
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/269—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension including synthetic resin or polymer layer or component

Definitions

  • the present invention relates to composite wooden materials for musical instruments.
  • the present invention also relates to manufacturing methods of composite wooden materials and musical instruments composed of composite wooden materials.
  • US 2006/272470 A1 discloses a musical instrument, such as an electric or bass guitar, which is formed of a lamination of wood layers having differing grain orientations in adjacent layers, the grain orientations defining a crossing angle less than 90°.
  • US 4 533 589 A describes the production of composite materials from layers of wood veneer and fibres bonded together and impregnated with resin.
  • the method includes the steps of (a) impregnating at least one layer of reinforcement fibres with a first resin, (b) coating surfaces of at least one layer of wood veneer with a second resin, (c) stacking the at least one resin impregnated reinforcement fibre layer with the at least one layer of resin coated wood veneer, and (d) bonding the layers together under conditions of pressure and temperature appropriate to the resins employed in step (a) and step (b) to produce a laminate.
  • WO 03/034399 A1 describes a method of construction and fabrication of organ windpipes and wind musical instruments utilizing composite materials.
  • the fiber reinforced composite construction is a combination of fibers and resinous material.
  • the fibrous material maybe Carbon fibers, and/or Kevlar fibers, and/or fiberglass fibers, and/or wood veneer(s) and/or core material, or any combination thereof, which is oriented and layered to create a laminate.
  • the fibrous material can be pre-impregnated with a resinous material or impregnated with a resinous material.
  • US 2002/066354 A1 describes a soundboard for acoustic musical instruments.
  • the soundboard is produced as a composite fiber sandwich.
  • the core plate of the sandwich construction is provided with at least one recess.
  • a composite wooden material according to the present invention is provided as set forth in claim 1.
  • the woody members are joined together such that the fibers thereof are uniformly aligned in the desired direction, it is possible to achieve good anisotropy as natural timbers, thus yielding good sound quality and good tone color as natural timbers. Due to the impregnation of the epoxy resin into the woody members, it is possible to achieve high adhesive strength, high acoustic velocity, and a low underdamping factor. In addition, it is possible to reduce variations of dimensions due to the absorption and desorption of moisture in the composite wooden material.
  • a composite wooden material according to the present invention is a composite timber composed of timbers joined using an epoxy resin.
  • timbers are composed of woody fibers whose fiber-aligning directions are uniformly aligned with musical instruments.
  • timbers are exemplified in woody fibers or woody veneers in which fiber lengths are set to 50 mm or more.
  • woody fibers it is possible to use fiber-processed natural timbers, such as hemp fibers, kenaf fibers, jute fibers, defibrated bamboos, and blasted bamboo fibers.
  • Blasted bamboo fibers are prepared in such a way that bamboo tips having desired cutting lengths are put into an airtight pressure chamber and are then subjected to a pressurization and heating process in a steam atmosphere at the temperature of 140 °C through 200 °C under the pressure of 0.36 MPa through 1.55 MPa, for example. Thereafter, the pressure chamber is opened so as to blast the bamboo tips, which thus form fibers.
  • the average diameter of blasted bamboo fibers ranges from 0.1 mm to 1 mm and preferably ranges from 0.1 mm to 0.5 mm.
  • woody veneers it is preferable to use veneers extracted from natural timbers such as grenadilla, birch, spruce, maple, Japanese oak, Melan arch, ash, poplar, bubinga, mahogany, zelkova, kapur, and beech.
  • Timbers with the fiber length of 50 mm or more can be uniformly aligned with each other in the fiber-aligning direction so as to achieve good anisotropy as natural timbers.
  • Timbers with a fiber length less than 50 mm are hardly aligned in the fiber-aligning direction, so that they may hardly achieve anisotropy.
  • it is not necessary to uniformly set the fiber length of the timbers because the present invention simply requires a fiber length of 50 mm or more.
  • the fiber length of each woody veneer may agree with the entire length of each woody veneer along its fiber-aligning direction.
  • the fiber length of each woody fiber may agree with the entire length of each woody fiber.
  • An epoxy resin can be infiltrated into a timber or applied to the surface of a timber.
  • a plurality of timbers is joined together using an epoxy resin and is then solidified into a desired shape.
  • the impregnation factor of the epoxy resin range from 5 weight-percent to 50 weight-percent, i. e. the epoxy resin portion amounts to 5 to 50 weight-percent of the composite wooden material.
  • the impregnation factor of the epoxy resin ranges from 10 weight-percent to 40 weight-percent, and it optimally ranges from 20 weight-percent to 30 weight-percent.
  • An epoxy resin portion of over 50 weight-percent makes it difficult for timbers to coordinate with each other in the fiber-aligning direction. Less than 5 weight-percent of the epoxy resin decreases the adhesive strength between timbers.
  • epoxy resin it is possible to use bisphenol-A, bisphenol-F, bisphenol-AD, novolac, and biphenyl, for example.
  • the specific gravity of the composite wooden material needs to agree with a target value of specific gravity of a certain natural timber to be simulated.
  • the specific gravity of the composite wooden material ranges from 1.0 to 1.2.
  • the composite wooden material whose specific gravity deviates from the above range may degrade sound quality.
  • the specific gravity is adjusted by controlling pressure applied to the composite wooden material subjected to compressive molding. Alternatively, the specific gravity is adjusted by forming cells (or bubbles) inside the composite wooden material subjected to foam molding.
  • Fig. 1 is a cross-sectional view of a composite wooden material 1 including a plurality of woody fibers 2 according to a first embodiment of the present invention.
  • the woody fibers 2 are solidified and molded using an epoxy resin 3, wherein they are uniformly aligned in a fiber-aligning direction D1.
  • the epoxy resin 3 is partially impregnated into the woody fibers 2, or the epoxy resin 3 is applied to the surface of each woody fiber 2.
  • Fig. 2 is a cross-sectional view of a composite wooden material 11 including a plurality of woody veneers 12 according to a second embodiment of the present invention.
  • the woody veneers 12 are laminated and bonded together using an epoxy resin, wherein they are uniformly aligned in a longitudinal direction D2.
  • the epoxy resin is impregnated into the woody veneers 12 so that the woody veneers 12 join together via the epoxy resin applied to the surfaces of adjacent ones.
  • the epoxy resin may be applied to only the surface of each woody veneer 12.
  • a plurality of woody members such as woody fibers or woody veneers with a fiber length of 50 mm or more is prepared in advance.
  • the woody members are soaked in a solution of an unhardened epoxy resin.
  • the unhardened epoxy resin is diluted with a solvent at the concentration of 10 weight-percent through 70 weight-percent, preferably at the concentration of 20 weight-percent through 60 weight-percent.
  • a low concentration of the diluted epoxy resin decreases the adhesive strength undesirably, while a high concentration of the diluted epoxy resin increases the viscosity of the solution, thus making it difficult to handle the solution and to impregnate the epoxy resin into the woody members.
  • the woody members are soaked into the solution for a long time so that the unhardened epoxy resin is impregnated into the woody members with an impregnation factor of 5 weight-percent through 50 weight-percent.
  • the impregnation factor of the epoxy resin impregnated into the woody members is adjusted by controlling the concentration of the epoxy resin diluted with the solvent or by controlling the soaking time. In this connection, it takes a short time to impregnate the epoxy resin into the woody veneers which are soaked in the solution in a decompressed atmosphere.
  • the woody members impregnated with the epoxy resin are dried in the atmosphere so as to completely remove the solvent therefrom.
  • the drying time is suitably adjusted so as to completely eliminate the solvent from the woody members.
  • the woody members impregnated with the epoxy resin are put into the molding equipment such that they are uniformly aligned in the fiber-aligning direction.
  • the molding equipment is filled with woody fibers uniformly aligned in the fiber-aligning direction. Woody veneers are laminated and uniformly aligned in the fiber-aligning direction and are then put into the molding equipment.
  • the woody members are subjected to heating and compressive molding in the molding equipment so that they are formed in the desired shape while the epoxy resin is hardened.
  • the heating temperature ranges from the hardening temperature of the epoxy resin to the decomposition temperature of the epoxy resin
  • the surface pressure is set to 10 MPa
  • the pressurization time is set to sixty minutes, for example.
  • the specific gravity of the composite wooden material is adjusted during the compressive molding.
  • a foaming agent is added to the molding equipment filled with the woody members during the heating and compressive molding, wherein the woody members are subjected to foaming during the compressive molding so that cells (or bubbles) are formed inside the composite wooden material, thus adjusting the specific gravity.
  • the unhardened epoxy resin and the woody members which are uniformly aligned in the fiber-aligning direction are put into the molding equipment and are then subjected to heating and compressive molding.
  • a plurality of woody members with the fiber length of 50 mm or more is prepared in advance.
  • woody members it is possible to use either woody fibers or woody veneers.
  • Woody members are uniformly aligned in the fiber-aligning direction and are put into the molding equipment.
  • the molding equipment is filled with woody fibers which are uniformly aligned in the fiber-aligning direction.
  • woody veneers which are uniformly aligned in the fiber-aligning direction are laminated together and are then put into the molding equipment.
  • the molding equipment is filled with an unhardened epoxy resin in addition to the woody members. It is possible to form the unhardened epoxy resin in various shapes such as powder, lumps, and fillers. It is preferable that the average particle diameter of the epoxy resin range from 0.01 mm to 2 mm, and it is optimal that the average particle diameter of the epoxy resin range from 0.05 mm to 0.5 mm.
  • the epoxy resin of very small average particle diameter is not preferable because it is difficult to handle and is not preferable.
  • the epoxy resin of very large average particle diameter is not preferable because it may allow cells (or bubbles) to remain during the compressive molding so that the specific gravity thereof will decrease.
  • the mixture composed of the epoxy resin and the woody members is prepared in advance and is then put into the molding equipment.
  • the epoxy resin and the woody members are independently put into the molding equipment so as to form the mixture therein.
  • the present embodiment does not need to dissolve the epoxy resin with the solvent; hence, it eliminates the step for removing the solvent.
  • the impregnation factor of the epoxy resin impregnated into the composite wooden material is adjusted by controlling the mixing ratio of the epoxy resin.
  • the woody members and the epoxy resin are subjected to heating and compressive molding in the molding equipment so that they are joined together in a desired shape while the epoxy resin is hardened simultaneously, thus producing the composite wooden material for use in a musical instrument.
  • the composite wooden material of the present embodiment achieves good anisotropy as natural timbers, thus yielding good sound quality as natural timbers.
  • the epoxy resin included in the composite wooden material contributes to high adhesive strength, high acoustic velocity, and low underdamping factor (tan ⁇ ), and it also reduces dimensional variations due to absorption and desorption of moisture which is unique to conventional timbers.
  • the impregnation factor of the epoxy resin is controlled within the range of 5 weight-percent through 50 weight-percent, the woody members are easily aligned in the fiber-aligning direction; hence, it is possible to improve the adhesive strength between the woody members, thus improving the strength of the composite wooden material.
  • the specific gravity is controlled within the range of 1.0 through 1.2, the specific gravity of the composite wooden material agrees with the target value of specific gravity of natural timbers, thus improving the sound quality.
  • the composite wooden material of the present embodiment is preferably used as a constituent member of acoustic musical instruments.
  • the composite wooden material of the present embodiment is suitable for woodwind instruments such as clarinets, oboes, piccolos, and recorders.
  • the composite wooden material of the present embodiment can be used as a substitute material for woody parts used in any types of musical instruments such as stringed instruments and percussion instruments.
  • any types of acoustic musical instruments can be produced using the composite wooden material of the present embodiment substituted for conventional timbers in accordance with the usual method. Compared to conventional musical instruments using natural timbers, musical instruments using the composite wooden material of the present embodiment demonstrate equivalent or higher sound quality without having individual differences.
  • composite wooden material of the present embodiment is suitable for any types of acoustic materials such as diaphragms of speakers and speaker boxes.
  • the manufacturing method of the present embodiment stipulates that the woody members are uniformly aligned in the fiber-aligning direction and are then subjected to heating and compressive molding; hence, the composite wooden material of the present embodiment achieves good anisotropy as natural timbers and also demonstrates the equivalent sound quality as natural timbers.
  • the present inventors produced various examples of composite wooden materials, which were compared with each other so as to verify the validity and significance of the present invention.
  • blasted bamboo fibers with an average thickness of 0.3 mm were cut into pieces with a fiber length of 500 mm.
  • Blasted bamboo fibers whose fiber lengths were prepared in advance were soaked into an acetone-methanol mixed solution which included a hardening agent and an unhardened epoxy resin (e.g. JER828 manufactured by Japan Epoxy Resins Co. Ltd.) at a concentration of 50 weight-percent, wherein the final impregnation factor of the epoxy resin was adjusted by controlling the soaking time.
  • Blasted bamboo fibers were extracted from the solution at a suitable time when adequately impregnated with the epoxy resin and then dried in the atmosphere for one day.
  • blasted bamboo fibers impregnated with the epoxy resin which were uniformly aligned in the fiber-aligning direction were put into the molding equipment and were then subjected to heating and compressive molding under the desired condition, i.e. at the heating temperature of 200 °C, the surface pressure of 10 MPa, and the pressurized time of sixty minutes, thus producing a composite wooden material of a rectangular parallelepiped shape in the desired dimensions of 500 mm ⁇ 40 mm ⁇ 40 mm.
  • the fiber-aligning direction of blasted bamboo fibers agreed with the longitudinal direction of the composite wooden material.
  • bamboo fibers with the average thickness of 0.5 mm were cut into pieces with the fiber length of 50 mm. These bamboo fibers were mixed with a hardening agent and powder in which an unhardened epoxy resin (e.g. JER1002 manufactured by Japan Epoxy Resins Co. Ltd.) was ground into particles with the average particle diameter of 0.1 mm. The final impregnation factor of the epoxy resin was adjusted by controlling the mixing ratio of the epoxy resin with bamboo fibers. Then, bamboo fibers impregnated with the epoxy resin were put into the molding equipment such that they were uniformly aligned in the fiber-aligning direction.
  • an unhardened epoxy resin e.g. JER1002 manufactured by Japan Epoxy Resins Co. Ltd.
  • bamboo fibers impregnated with the epoxy resin were subjected to heating and compressive molding under the desired condition, i.e. at the heating temperature of 200 °C, the surface pressure of 10 MPa, and the pressurized time of sixty minutes, thus producing a composite wooden material of a rectangular parallelepiped shape in the desired dimensions of 500 mm ⁇ 40 mm ⁇ 40 mm.
  • the fiber-aligning direction of defibrated bamboo fibers agreed with the longitudinal direction of the composite wooden material.
  • a birch veneer of 500 mm ⁇ 40 mm was prepared and sliced with the thickness of 0.6 mm, wherein the fiber-aligning direction agreed with the longitudinal direction.
  • the birch veneer was soaked into an acetone-methanol mixed solution which included a hardening agent and an unhardened epoxy resin (e.g. JER828 manufactured by Japan Epoxy Resins Co. Ltd.) with a concentration of 50 weight-percent. Then, the birch veneer soaked in the above solution was decompressed and was impregnated with the epoxy resin in the vacuum condition. The final impregnation factor of the epoxy resin was adjusted by controlling the soaking time. The birth veneer was extracted from the solution at a suitable time when adequately impregnated with the epoxy resin and then dried in the atmosphere for one day.
  • an unhardened epoxy resin e.g. JER828 manufactured by Japan Epoxy Resins Co. Ltd.
  • a composite wooden material of Comparative Example 1 was produced in accordance with the Example 2, except that the fiber length of bamboo fibers was changed to 30 mm.
  • a composite wooden material of Comparative Example 2 was produced in accordance with the Example 2, except that bamboo fibers were aligned in random directions.
  • a composite wooden material of Comparative Example 3 was produced in accordance with the Example 3, except that an unhardened thermosetting resin of a liquid melamine resin was substituted for the unhardened epoxy resin, and the birch veneer was subjected to heating and compressive molding at the temperature of 130 °C and the surface pressure of 7 MPa.
  • Table 1 refers to the resin type, the impregnation factor F imp (weight-percent), the timber type, the fiber length (Length) (mm), the fiber-aligning direction (Alignment) which is "uniform" (or regular) or "random", the specific gravity p, the acoustic velocity V (m/s), and the underdamping factor F damp (tan ⁇ ).
  • the acoustic velocity V and the underdamping factor F damp are produced by way of the following procedure.
  • An elasticity modulus is estimated based on the resonance frequency of the primary double-end free deflection vibration in accordance with the free oscillation method using an FFT analyzer (e.g. DS2000 manufactured by Ono Sokki Co. Ltd.).
  • the acoustic velocity E/ ⁇ 1/2 is calculated based on the elasticity modulus and the specific gravity p.
  • the underdamping factor F damp (tan ⁇ ) is calculated based on the resonance peak time envelope of the primary vibration. Both the acoustic velocity V and the underdamping factor F damp are measured along the fiber-aligning direction of a composite wooden material. The measurement is performed in a room at 22 °C and 60 % RH (relative humidity). Table 1 and Fig.
  • Table 1 and Fig. 3 clearly shows the high acoustic velocity of 4,000 m/s through 4,800 m/s and the low underdamping factor of 5 ⁇ 10 -3 through 7 ⁇ 10 -3 along the fiber-aligning direction.
  • the composite wooden materials of Examples 1 and 2 show good values of the acoustic velocity and the underdamping factor which are close to those of the natural grenadilla; hence, they yield good sound quality as natural timbers.
  • the inventors verified that the clarinets, which were produced by cutting the composite wooden materials of Examples 1-3, demonstrated good tone colors.
  • the composite wooden materials of Comparative Examples 1-3 are lower in terms of the acoustic velocity and are increased in the underdamping factor. This is because the composite wooden material of Comparative Example 1 had short lengths of bamboo fibers, the composite wooden material of Comparative Example 2 had the random fiber-aligning direction of bamboo fibers, and the composite wooden material of Comparative Example 3 substituted the melamine resin for the epoxy resin.
  • the inventors verified that the clarinets, which were produced by cutting the composite wooden materials of Comparative Examples 1-3, were degraded in tone color in comparison with the clarinets composed of the composite wooden materials of Examples 1-3.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Forests & Forestry (AREA)
  • Materials Engineering (AREA)
  • Multimedia (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Stringed Musical Instruments (AREA)

Claims (3)

  1. Matériau en bois composite comprenant :
    une pluralité d'éléments ligneux composés de fibres sélectionnées parmi :
    des fibres ligneuses, des fibres de bambou durcies, des fibres de bambou défibrées, des fibres de chanvre, des fibres de kénaf ou des fibres de jute, et imprégnées avec une résine époxy non durcie, caractérisé en ce que l'élément ligneux comporte des fibres ayant une longueur de fibre de 50 mm ou plus ;
    dans lequel les éléments ligneux sont imprégnés avec une partie de résine époxy non durcie, et dans lequel la partie de résine époxy constitue 5 à 50 pourcent en poids du matériau en bois composite,
    dans lequel les éléments ligneux sont liés les uns aux autres avec la résine époxy de sorte que leurs fibres soient uniformément alignées selon une direction souhaitée d'alignement des fibres, et
    dans lequel la gravité spécifique du matériau en bois composite est comprise entre 1,0 et 1,2, où 1,0 est exclu.
  2. Procédé de fabrication d'un matériau de bois composite comprenant les étapes suivantes :
    la préparation d'une pluralité d'éléments ligneux comportant des fibres ayant une longueur de fibre de 50 mm ou plus, dans lequel les éléments ligneux sont composés de fibres sélectionnées parmi des fibres ligneuses, des fibres de bambou durcies, des fibres de bambou défibrées, des fibres de chanvre, des fibres de kénaf ou des fibres de jute, caractérisé en ce que les éléments ligneux sont imprégnées avec une partie de résine époxy non durcie ;
    l'unification des éléments ligneux avec la partie de résine époxy non durcie, dans lequel la partie de résine époxy non durcie constitue 5 à 50 pourcent en poids du matériau en bois composite ;
    l'alignement uniforme des fibres des éléments ligneux selon une direction souhaitée d'alignement des fibres ; et
    l'application aux éléments ligneux d'un chauffage et d'un moulage par compression, et
    dans lequel la gravité spécifique du matériau en bois composite est comprise entre 1,0 et 1,2, où 1,0 est exclu.
  3. Instrument de musique acoustique constitué d'un matériau en bois composite, comportant :
    une pluralité d'éléments ligneux composés de fibres sélectionnées parmi des fibres ligneuses, des fibres de bambou durcies, des fibres de bambou défibrées, des fibres de chanvre, des fibres de kénaf ou des fibres de jute, caractérisé en ce que les éléments ligneux comportent des fibres ayant une longueur de fibre de 50 mm ou plus ; et
    dans lequel les éléments ligneux sont imprégnés avec une partie de résine époxy non durcie, dans lequel la partie de résine époxy non durcie constitue 5 à 50 pourcent en poids du matériau en bois composite,
    dans lequel les éléments ligneux sont liés les uns aux autres avec la résine époxy non durcie de sorte que leurs fibres soient uniformément alignées selon une direction souhaitée d'alignement des fibres, et
    dans lequel la gravité spécifique du matériau en bois composite est comprise entre 1,0 et 1,2, où 1,0 est exclu.
EP10001361.4A 2009-02-12 2010-02-10 Timbre acoustique pour instrument de musique Active EP2223785B1 (fr)

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JP2009029843A JP5593613B2 (ja) 2009-02-12 2009-02-12 音響用木質材料及びその製造方法並びにアコースティック楽器

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Publication number Publication date
JP5593613B2 (ja) 2014-09-24
JP2010184420A (ja) 2010-08-26
US8217249B2 (en) 2012-07-10
EP2223785A2 (fr) 2010-09-01
EP2223785A3 (fr) 2010-11-17
US20100199831A1 (en) 2010-08-12

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